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      09-09-2013, 07:28 PM   #1
TriAdX
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Power Surge?

So, after a long road trip my 07 z4m coupe started acting up whenever the rpms are above idle.

Whenever I give it gas or even just let the clutch out (at speed) and the rpms raise, the center console (nav/ac/radio) lights flip on and off (nav actually goes to reset screen and radio audio goes off and on) and the ABS, Traction Control and Brake lights flash on and off.

It doesnt do it if I am coasting at any speed or even sitting, as long as the RPMS are idle. I am 99% sure it's not just a lose wire as I have a very bumpy road I have gone down and again, as long as its just idle, no issues.

ANY ideas as to what could be causing this? Could my Alt be going bad? or Power regulator?

I am at a loss...
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      09-09-2013, 08:12 PM   #2
StickMon
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Put a voltmeter on it and see what the buss voltage is doing versus the revs.
I would do it soon, and carefully. If it goes above 15 Vdc, shut her down and get a new alternator before you fry a module.
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Last edited by StickMon; 09-10-2013 at 09:04 AM..
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      09-09-2013, 11:45 PM   #3
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Oh.. another thing of note... It doesnt do it AT ALL until it gets about 1/2 way to normal running temp.

so for about 10 min it's fine, then once it's 1/4 on temp... it starts up.
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      09-10-2013, 12:08 AM   #4
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How old is your battery?

Do a search on battery failures and see if any of the symptoms sound familiar.
You would think the symptoms of a failing battery would simply be that it's hard to turn over when starting, but our cars are more exciting than that.
People have reported some pretty crazy things that have been solved with a new battery.
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Last edited by StickMon; 09-10-2013 at 09:04 AM..
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